4 Which of the following is not an example of ideal solution a) Solution of benzene in toluene b) Solution of ethyl and propyl alcohol c) Paraffin hydrocarbon gas in paraffin oil d) Solution of isobutane and olefins 5 Which of the following is not the example of mass transfer a) Adsorption b) absorption c) Distillation d) All of the above 6 The equilibrium characteristics of the solubility of a gas in liquid helps to determine the a) Rate b) Concentration c) Time d) None of the above 7 Which of the following is not unit of concentration a) PPM b) g/L c) Molarity d) None of the above